Main drive of a mill for cold rolling of tubes

ABSTRACT

The invention consists in that the chain of the transmission of the main drive of the mill has an auxiliary motor which is designed to adjust the mill and replace the working stand in the course of the mill operation.

United States Patent Shmidrov et al. 45 Aug. 15, 1972 [5 MAIN DRIVE OF A MILL FOR COLD [58] Field of Search ..72/249, 208, 209

ROLLING OF TUBES v [72] Inventors: Jury Petrovich Shmidrov, ulitsa [56] References Cmd Sovetskaya 9, kv. 47, Elektrostal, UNITED STATES PATENTS Moskovskaya oblast; Felix Davydovich Mogflevkin, umsa 3,293,898 12/ 1966 Thomas et al. ..72/249 Svobody, 145, kv. 55; Oleg Yakovlevich Rabinmich umsa al igfs ai t l iti sihyai & Nissen Gagarina, ll, kv. 37, both of Chey lyabinsk, all of USSR. [57] ABSTRACT [22] Flled: July 1970 The invention consists in that the chain of the trans- [21] A l, N 51,557 mission of the main drive of the mill has an auxiliary motor which is designed to adjust the mill and replace 52 us. Cl ..72/249, 72/208 the working stand in the mum of the min operation [51 1 Int. Cl. ..B2lb 35/00 2 Claim, 3 Drawing Figures PATENTEDAUB 15 1912 3.683 664 sum 1 or 3 FIG] MAIN DRIVE OF A MILL FOR COLD ROLLING OF TUBES The present invention relates to mills for cold rolling of tubes and, more particularly, to their main drives.

Known in the art is the main drive of a mill for cold rolling of tubes, comprising a main motor with a reducing gear, connected with the crank mechanism of the working stand, and through the intermediary of a transmission with a distributing feeder.

In the course of operation of the mill it is often necessary to replace the working stand, for which purpose the pins have to be knocked out of the connecting rods of the crank mechanism, which enter the lugs of the working stand, and to drive them anew into the new stand. In the course of the afore-described operation the axis of the hole of the connecting rod must be aligned with the axis of the hole in the lug of the working stand. In conventional main drives this operation is carried out by means of cranes, is fraught with inconveniences and results in prolonged idle time of the mill, thus decreasing its efficiency.

Besides, after repair of mechanisms of the mill the latter has to be adjusted, i.e., the feeding and turning of the blank must be coordinated with the position of the working stand. For this purpose the crank mechanism has to be turned to coordinate in this way the feeding and turning of the blank with the position of the working stand. The motor of the main drive cannot be employed for the purpose because of the high speed of its rotation and possibility of failures which may be caused by the great power of the motor.

On the other hand, employment of a crane for tuming the crank mechanism and for replacing the stand is fraught with inconveniences, results in a prolonged outof-service period of the mill, and thus decreases its efficiency.

It is an object of the present invention to provide such a main drive of the mill for cold rolling of tubes that would ensure quick replacement of the working stand without employing any crane.

Another object of the present invention is to provide such a main drive that would ensure coordination of feeding and turning of the blank with the position of the working stand also without employing any crane operations. Still another object of the present invention is to provide such a main drive that would ensure increasing of its efficiency through a reduction of the idle period thereof by obviating the crane operations.

This and other objects are accomplished by that in the main drive of the mill for cold rolling of tubes, com prising a main motor with a reducing gear, connected with the crank mechanism of the working stand and through the intermediary of a transmission with a distributing feeder, in accordance with the invention, the transmission chain comprises an auxiliary motor with a reducing gear connected by its outlet shaft with the aid of the transmission with the distributing feeder, and through the intermediary of the same transmission and the reducing gear of the main motor with the crank mechanism of the working stand, which auxiliary motor is designed to adjust the mill and to replace the working stand in the course of operation of the mill.

It is expedient to connect to the slow-action outlet shaft of the reducing gear of the auxiliary motor a gear box installed in the transmission chain and provided 2 with a device for switching-in and switching-off the outlet shaft of the reducing gear of the auxiliary motor.

The following description of an exemplary embodiment of the present inventionis given with reference to the accompanying drawings, in which:

FIG. 1 shows a diagram of the main drive of a mill for cold rolling of tubes, according to the invention;

FIG. 2 shows an auxiliary motor with a reducing gear and a gear box of the main drive of a mill for cold rolling of tubes, according to the invention, (a plan view);

FIG. 3 is a section taken along line III-III of FIG. 2.

In accordance with the present invention, the main drive of a mill for cold rolling of tubes has motor 1 (FIG. 1) with reducing gear 2 which by means of outlet shaft 3 is connected with crank mechanism 4, and by means of outlet shaft 5 is connected through the inter mediary of transmission 6 withdistributing feeder 7. The crank mechanism 4 is connected with working stand 9 through the intermediary of connecting rods 8 and by means of lugs 10 into which pins 1 1 are inserted.

The transmission 6.chain comprises auxiliary motor 12 with reducing gear 13 (FIG. 2) which by its outlet shaft 14 is connected by means of the same transmission with the distributing feeder 7, and through the intennediary of the same transmission and thereducing gear 2 of the main motor 1 with the crank mechanism of the working stand 9, and is designed to adjust the mill and replace the working stand :in the course of the mill operation.

The auxiliary motor 12 with the reducing gear 13 is connected with the transmission 6 in the following way.

The transmission 6 chain has gear box 15 whose gear 16 is mountedon shaft 17 of the transmission 6. The gear 16 is mounted stationary in the axial direction, and can engage gear 18 that is mounted on splined shaft 19 and is capable of displacing in the axial direction and, consequently, engaging or disengaging the gear 16. The gear 18 is moved by means of switching-over mechanism 20 (FIGS. 2,3) having carriage 21 (FIG. 3) and sliding blocks 22 (FIGS. 2, 3) which enter annular groove 23 of the gear 18. The carriage 21 along with the sliding blocks 22 is moved by screw 24 (FIG. 3). By means of the splined shaft 19 and coupling 25 (FIG. 2) the gear box 15 is connected with the outlet shaft 14 of the reducing gear 13 of the auxiliary motor 12. The transmission 6 chain has couplings 26 (FIG. 1) by means of which the auxiliary motor 12 with the reducing gear 13 can engage and disengage the outlet shaft 5 of the reducing gear 2 of the main motor 1 and the transmission 6.

The main drive functions as follows:

With tubes being rolled, the main motor operates to rotate the reducing gear 2 which through the intermediary of the outlet shaft 3 rotates the crank mechanism 4 imparting a reciprocating motion to the working stand 9.

From the reducing gear 2 the rotation is imparted through the intermediary of the other outlet shaft 5 to the transmission 6 operatively connected to the distributing feeder 7 which transforms the continuous rotation into an intermittent one. With the working stand 9 in its extreme left position, a blank (not shown in the drawing), is both fed and turned, whereas, with the working stand 9 in its extreme right position, the

blank is turned only. With the main motor 1 operating, the auxiliary motor 12 does not operate, and the gear 18 is disengaged from the gear 16 by means of the switching-over mechanism 20.

In case the mill has to be adjusted, the main motor 1 of the main drive is switched off. The gear 18 engages the gear 16 by means of the switching-over mechanism 20. With the aid of the auxiliary motor 12, reducing gear 13 and gear box 15 the working stand 9 is moved in its extreme left position. Thereupon, the coupling 26 is disconnected, and the distributing feeder 7 is rotated by means of the auxiliary motor 12. The moment the feeding and turning of the blank coinside, the auxiliary motor is stopped with the blank turned through onehalf of its turn. Then, the coupling 26 is connected to complete the adjustment of the mill.

When replacing the working stand 9, the pins 11 are knocked out of the holes of the lugs and connecting rods 8. The working stand is removed, and is replaced with another one. Then, the auxiliary motor 12 is switched on to align the axes of the holes in the connecting rods 8 with the axes of the holes in the lugs 10 of the working stand 9. Thereupon, the pins 11 are inserted, the gear 18 is disengaged from the gear 16 by means of the switching-over mechanism 20, and the mill is ready to roll tubes.

What is claimed is:

1. A main drive for the working stand of a mill for the cold rolling of tubes, comprising a main motor with a reducing gear; a crank mechanism for said working stand, said main motor including a reducing gear connected to said crank mechanism; a distributing feeder having a transmission connected with said reducing gear; an auxiliary motor having a reducing gear, said auxiliary motor being installed in the operative chain of said transmission; said auxiliary motor reducing gear including an outlet shaft operatively connected through said transmission with said distributing feeder, said outlet shaft being further operatively connected through said transmission and through reducing gear of the main motor with the crank mechanism of said working stand.

2. A main drive of a mill according to claim 1, comprising a gear box connected to said outlet shaft of the auxiliary motor reducing gear; said gear box being installed in the operative chain of said transmission; and a device connected to said gear box for switching onand-ofi said outlet shaft. 

1. A main drive for the working stand of a mill for the cold rolling of tubes, comprising a main motor with a reducing gear; a crank mechanism for said working stand, said main motor including a reducing gear connected to said crank mechanism; a distributing feeder having a transmission connected with said reducing gear; an auxiliary motor having a reducing gear, said auxiliary motor being installed in the operative chain of said transmission; said auxiliary motor reducing gear including an outlet shaft operatively connected through said transmission with said distributing feeder, said outlet shaft being further operatively connected through said transmission and through reducing gear of the main motor with the crank mechanism of said working stand.
 2. A main drive of a mill according to claim 1, comprising a gear box connected to said outlet shaft of the auxiliary motor reducing gear; said gear box being installed in the operative chain of said transmission; and a device connected to said gear box for switching on-and-off said outlet shaft. 